Christine tells Greg he should build the jungle gym outside the guest house so she can watch the kids play and watch Ricki Lake at the same time without getting out of bed. On the episode before, Christine was complaining about how there isn't a TV in the guest house.
In the scene Greg where starts building the jungle gym, we see Jimmy come out, wondering what Greg is doing. When Jimmy enters the yard, he closes the door behind him. In a later shot, the door is now ajar, then at the end of the scene, the door is closed again.
Don: Look, Greg... you're tapdancing down jackass alley.